Terrain Heightmap repeating.

Hello fellow uniteers,

I've searched for this problem but i couldn't find anything regarding It. If there is an obvious solution I missed, I'd like to offer my apologies than.

So after fiddling quite long with it, I've got my heightmap to work. Except for one thing. The terrain repeats I have a picture of it here:

How would I go about solving it? Also, the image is 1025 by 1025, I'm on a Windows(The bittype thing matches), and the terrain size is 2000x (something like:) 200y 2000z.

Thanks in advance!